Block Diagram - Amp Section - Sony HCD-GT22 Service Manual

Q Q
3 7 6 3 1 5 1 5 0
7-3. BLOCK DIAGRAM – AMP Section –
BASS AGC
E
(Page 24)
IC441 (GT22/GT55)
IC441 (GT44)
OUT BUFFER
C
POWER AMP
IC251
(Page 24)
MUTING STANDBY SWITCH
Q251
R-CH
T E
L 1 3 9 4 2 2 9 6 5 1 3
SW OUT BUFFER LINE AMP
D
Q121 IC252
(Page 24)
(GT44/GT55)
MUTING
CONTROL SWITCH
Q261
1
w w w
HCD-GT22/GT44/GT55
+
Q489
TH441
OVER LOAD TEMPERATURE
DC DETECT
DETECT DETECT
Q481, 482
Q441 Q483, 484
+
R-CH
+ +
+ +
TEMPERATURE OVER LOAD
DC DETECT
DETECT DETECT
Q505, 506
Q503, 507 Q501
POWER AMP
IC501
MUTING
Q272
36
SYSTEM CONTROLLER
IC901 (3/4)
x a o
y
. i
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R-CH
–1
–2
R-CH
RY441
FAN MOTOR
R-CH DRIVE
Q043 – 045
D037
RELAY DRIVE
PROTECTOR
Q486, 488 (GT22)
Q485
Q480, 486, 488 (GT44/GT55)
PROTECT
DETECT
Q487
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3 7 6
RY501
RELAY DRIVE
Q502
SUB WOOFER
SWITCH
Q274
2
u 1 6 3
.
25 25
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2 4
8 9 9
HP IN
B (Page 24)
AUDIO+9V
J803
R-CH
PHONES
JK441
+
L
–
SPEAKER
–
R
+
M001
M
(FAN)
FAN MOTOR
DETECT
Q046
PROTECT
+
F (Page 26)
3 1 5 1 5 0 8 9 2
JK501
+
SUB WOOFER OUT
–
R-ch is omitted due to same as L-ch.
SIGNAL PATH
: TUNER (FM/AM)
m
c o
HCD-GT22/GT44/GT55
2
8 9 9
4 9 8 2 9 9